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Diameter changes of occluded venous coronary artery bypass grafts in electron beam tomography: preliminary findings
Christian N H Enzweiler1, Till H Wiese, Jan Petersein
1Department of Radiology, Charité, Humboldt-Universität zu Berlin, Berlin, Germany. christian.enzweiler@charite.de
Insights
Electron beam tomography (EBT) can differentiate acute from chronic coronary bypass graft occlusions by measuring graft diameter. This non-invasive method may help avoid unnecessary procedures.
Area of Science:
- Cardiovascular Imaging
- Medical Diagnostics
- Interventional Cardiology
Background:
- Coronary artery bypass grafting (CABG) is a common procedure for treating coronary artery disease.
- Graft occlusion remains a significant cause of graft failure and adverse cardiac events.
- Differentiating acute from chronic occlusions is crucial for guiding treatment strategies.
Purpose of the Study:
- To evaluate the utility of electron beam tomography (EBT) in distinguishing between acute and chronic venous coronary bypass graft occlusions.
- To assess the accuracy of graft diameter measurements obtained via EBT for occlusion differentiation.
Main Methods:
- Contrast-enhanced EBT volume studies were performed in 20 patients with 39 bypass grafts (16 patent, 23 occluded).
- Grafts were categorized into patent, acutely occluded (within 10 days post-surgery), and chronically occluded (≥6 months post-surgery).
- Mean graft diameters were measured by blinded readers, and statistical analysis was conducted using the Mann-Whitney-U-test.
Main Results:
- Mean graft diameters differed significantly across groups: patent (3.9 mm), acutely occluded (5.4 mm), and chronically occluded (0.3 mm) (P<0.01).
- EBT demonstrated high sensitivity and specificity for detecting acute and chronic occlusions with specific cut-off values.
- Sensitivity/specificity for acute occlusion detection was 87%/92% (cut-off 4.5 mm), and for chronic occlusion, it was 92%/96% (cut-off 1 mm).
Conclusions:
- EBT enables non-invasive differentiation between acute and chronic venous coronary bypass graft occlusions.
- This capability may help prevent unnecessary invasive recanalization procedures.
- Findings suggest that venous grafts may retain their ability to increase in diameter during acute thrombosis.
Objective:
To differentiate acute from chronic graft occlusions through diameter measurements by means of electron beam tomography (EBT).
Methods:
Contrast enhanced EBT volume studies were carried out in 37 patients with one or more occluded venous coronary bypass grafts. Seventeen of 37 patients did not meet the inclusion criteria and were excluded from the assessment. The remaining 20 patients had a total of 39 bypasses (16 patent, 23 occluded) and were assigned to one of three groups: group A consisted of patent grafts only (patent grafts, 13 patients). Group B comprised 11 of 23 occluded grafts diagnosed within 10 days after bypass surgery (acutely occluded grafts, ten patients). Group C contained 12 of 23 bypass occlusions that were at least 6 months old as documented by coronary angiography (chronically occluded grafts, ten patients). The mean graft diameter was determined by repetitive measurements on a workstation through blinded readers. The Mann-Whitney-U-test for unpaired samples was used for statistical evaluation.
Results:
Mean graft diameter for groups A-C (patent, acutely, and chronically occluded bypasses, respectively) was 3.9 mm (+/-0.6; n=16), 5.4 mm (+/-1.9; n=11), and 0.3 mm (+/-.9; n=12), respectively (P<0.01 each). Sensitivity and specificity for the detection of acute and chronic occlusions were 87 and 92% (cut-off 4.5 mm), respectively, and 92 and 96% (cut-off 1 mm), respectively.
Conclusions:
EBT may allow for non-invasive differentiation between acute and chronic venous coronary bypass occlusions. This could help prevent unnecessary invasive recanalization procedures. Body veins may conserve their ability to increase in diameter in acute thrombosis when transplanted as coronary bypasses.
